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The Nile is usually called the longest river in the world.

The Nile is usually called the longest river in the world.

It flows about 6,650 km through Africa — so long that a boat would take many weeks to travel from one end to the other.

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Most of the Earth is covered by water. Most of the Earth is covered by water. Rain comes from water that rises into clouds and falls back down. Rain comes from water that rises into clouds and falls back down. Rivers flow downhill until they reach the sea. Rivers flow downhill until they reach the sea. Ocean water tastes salty, but rain and rivers are fresh. Ocean water tastes salty, but rain and rivers are fresh. Ice is simply water that has frozen hard and cold. Ice is simply water that has frozen hard and cold.